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EP3781105B1 - Article absorbant comprenant une composition adhésive - Google Patents

Article absorbant comprenant une composition adhésive

Info

Publication number
EP3781105B1
EP3781105B1 EP19724298.5A EP19724298A EP3781105B1 EP 3781105 B1 EP3781105 B1 EP 3781105B1 EP 19724298 A EP19724298 A EP 19724298A EP 3781105 B1 EP3781105 B1 EP 3781105B1
Authority
EP
European Patent Office
Prior art keywords
adhesive composition
adhesive
copolymer
absorbent article
mpa
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19724298.5A
Other languages
German (de)
English (en)
Other versions
EP3781105A1 (fr
Inventor
Robert Haines Turner
Torsten Lindner
Matthias Morand
Benjamin John KUTAY
Holger Beruda
Ekaterina Ponomarenko
William L. Bunnelle
Jon FAGERNESS
Nick Fowler
Bill Turner
Andres Sustic
Enrico Buenacosa
Steve OETTING
Steve McHaney
J.J. Decair
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP3781105A1 publication Critical patent/EP3781105A1/fr
Application granted granted Critical
Publication of EP3781105B1 publication Critical patent/EP3781105B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/515—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads characterised by the interconnection of the topsheet and the backsheet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/58—Adhesives
    • A61L15/585—Mixtures of macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/04—Monomers containing three or four carbon atoms
    • C08F210/06—Propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/04—Monomers containing three or four carbon atoms
    • C08F210/08—Butenes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/10—Homopolymers or copolymers of propene
    • C09J123/14—Copolymers of propene
    • C09J123/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C09J123/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51441—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material
    • A61F2013/51452—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material being nonwovens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/53908—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
    • C08F2800/10—Copolymer characterised by the proportions of the comonomers expressed as molar percentages
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene

Definitions

  • an adhesive composition typically a hot melt adhesive composition, that is used to assemble components into an absorbent article such as a diaper (e.g. the construction adhesive).
  • the absorbent articles assembled use a construction adhesive that is substantially free of a tackifier.
  • Disposable absorbent articles such as adult incontinence articles, diapers, and training pants are generally manufactured by combining several components. These components typically include a liquid-permeable topsheet, a liquid-impermeable backsheet attached to the topsheet, and an absorbent core located between the topsheet and the backsheet. When the disposable article is worn, the liquid-permeable topsheet is positioned next to the body of the wearer. The topsheet allows passage of bodily fluids into the absorbent core. The liquid-impermeable backsheet helps prevent leakage of fluids held in the absorbent core.
  • the absorbent core generally is designed to have desirable physical properties, e.g. a high absorbent capacity and high absorption rate, so that bodily fluids can be transported from the skin of the wearer into the disposable absorbent article.
  • one or more components of a disposable absorbent article are adhesively bonded together.
  • adhesives have been used to bond individual layers of the absorbent article, such as the topsheet and backsheet together.
  • Adhesives have also been used to bond discrete components, such as fasteners and leg elastics or cuffs, to the article.
  • the adhesive is often called a construction adhesive because it is used to help construct the absorbent article from individual components.
  • FIG. 1 is a plan view of an exemplary absorbent article in a flat, uncontracted state.
  • Disposable in reference to absorbent articles, means that the absorbent articles are generally not intended to be laundered or otherwise restored or reused as absorbent articles (e.g., they are intended to be discarded after a single use and, preferably, to be recycled, composted or otherwise discarded in an environmentally compatible manner).
  • “Absorbent article” refers to devices which absorb and contain body exudates and, more specifically, refers to devices which are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body.
  • Exemplary absorbent articles include diapers, training pants, pull-on pant-type diapers (e.g., a diaper having a pre-formed waist opening and leg openings such as illustrated in U.S. Patent No. 6,120,487 ), refastenable diapers or pant-type diapers, adult incontinence briefs and undergarments, diaper holders and liners, feminine hygiene garments such as panty liners, absorbent inserts, and the like.
  • Proximal and distal refer respectively to the location of an element relatively near to or far from the longitudinal or lateral centerline of a structure (e.g., the proximal edge of a longitudinally extending element is located nearer to the longitudinal centerline than the distal edge of the same element is located relative to the same longitudinal centerline).
  • Body-facing and “garment-facing” refer respectively to the relative location of an element or a surface of an element or group of elements. “Body-facing” implies the element or surface is nearer to the wearer during wear than some other element or surface. “Garment-facing” implies the element or surface is more remote from the wearer during wear than some other element or surface (e.g., element or surface is proximate to the wearer's garments that may be worn over the disposable absorbent article).
  • Longitudinal refers to a direction running substantially perpendicular from a waist edge to an opposing waist edge of the article and generally parallel to the maximum linear dimension of the article. Directions within 45 degrees of the longitudinal direction are considered to be “longitudinal”.
  • Lateral refers to a direction running from a longitudinal edge to an opposing longitudinal edge of the article and generally at a right angle to the longitudinal direction. Directions within 45 degrees of the lateral direction are considered to be “lateral.”
  • Disposed refers to an element being located in a particular place or position.
  • Film refers to a sheet-like material wherein the length and width of the material far exceed the thickness of the material. Typically, films have a thickness of about 0.5 mm or less.
  • Water-permeable and “water-impermeable” refer to the penetrability of materials in the context of the intended usage of disposable absorbent articles. Specifically, the term “water-permeable” refers to a layer or a layered structure having pores, openings, and/or interconnected void spaces that permit liquid water, urine, or synthetic urine to pass through its thickness in the absence of a forcing pressure. Conversely, the term “water-impermeable” refers to a layer or a layered structure through the thickness of which liquid water, urine, or synthetic urine cannot pass in the absence of a forcing pressure (aside from natural forces such as gravity). A layer or a layered structure that is water-impermeable according to this definition may be permeable to water vapor, e.g., may be "vapor-permeable.”
  • Extendibility and “extensible” mean that the width or length of the component in a relaxed state can be extended or increased.
  • Elastic refers to a material which generally is able to extend to a strain of at least 50% without breaking or rupturing, and is able to recover substantially to its original dimensions after the deforming force has been removed.
  • Outboard and inboard refer respectively to the location of an element disposed relatively far from or near to the longitudinal centerline of the diaper with respect to a second element. For example, if element A is outboard of element B, then element A is farther from the longitudinal centerline than is element B.
  • Meltblown fibers means fibers formed by extruding a molten material, typically thermoplastic in nature, through a plurality of fine, usually circular, die capillaries as molten threads or filaments into converging high-velocity heated gas (e.g., air) streams that attenuate the filaments of molten material to reduce their diameter, which may be to microfiber diameter. Thereafter, the meltblown fibers are carried by the high-velocity gas stream and are deposited on a collecting surface to form a web of randomly dispersed meltblown fibers. Such a process is disclosed for example, in US3,849,241 . Meltblown fibers are microfibers which may be continuous or discontinuous, are generally smaller than 10 microns in diameter, and are generally self-bonding when deposited onto a collecting surface
  • “Devoid of,” “free of,” and the like, as those terms are used herein, means that the adhesive composition does not have more than trace amounts of background levels of a given material, ingredient, or characteristic following these qualifiers; the amount of the material or ingredient does not cause harm or irritation that consumers typically associate with the material or ingredient; or the material or ingredient was not added to the adhesive composition intentionally.
  • “devoid of” and “free of” can mean there is no measurable amount of the material or ingredient.
  • the adhesive composition in some forms can contain no measurable amount of a tackifier.
  • Heterophase polymer refers herein to a polymer having an amorphous character and at least some substantial crystalline content (at least 10 wt. % crystalline content) that can provide cohesive strength in the cooled adhesive mass.
  • the crystalline content can be in the form of stereoregular blocks or sequences.
  • Laminate means a structure in which one layer, material, component, web, or substrate is adhesively bonded, at least in part, to another layer, material, component, web, or substrate. As stated elsewhere in this application, a layer, material, component, web, or substrate may be folded over and adhesively bonded to itself to form a “laminated structure” or “laminate.”
  • chassis 22 The outer periphery of chassis 22 is defined by longitudinal side edges 12 and end edges 14.
  • the chassis 22 may have opposing longitudinal side edges 12 that are oriented generally parallel to the longitudinal centerline 100. However, for better fit, longitudinal side edges 12 may be curved or angled to produce, for example, an "hourglass" shape diaper when viewed in a plan view.
  • the chassis 22 may have opposing lend edges 14 that are oriented generally parallel to the lateral centerline 110.
  • the chassis 22 may comprises a liquid permeable topsheet 24 having longitudinal side edges 25, a backsheet 26, and an absorbent core 28 between the topsheet 24 and the backsheet 26.
  • the absorbent core 28 may have a body-facing surface and a garment facing-surface.
  • the topsheet 24 may be joined to the core 28 and/or the backsheet 26.
  • the backsheet 26 may be joined to the core 28 and/or the topsheet 24. It should be recognized that other structures, elements, or substrates may be positioned between the core 28 and the topsheet 24 and/or backsheet 26.
  • the chassis 22 comprises the main structure of the diaper 20 with other features may added to form the composite diaper structure.
  • topsheet 24 may be coated with a lotion as is known in the art.
  • suitable lotions include those described in US5,607,760 ; US5,609,587 ; US5,635,191 and US5,643,588 .
  • the topsheet 24 may be fully or partially elasticized or may be foreshortened so as to provide a void space between the topsheet 24 and the core 28. Exemplary structures including elasticized or foreshortened topsheets are described in more detail in US4,892,536 ; US4,990,147 ; 5,037,416 ; and US5,269,775 .
  • Exemplary absorbent structures for use as the absorbent core 28 are described in US4,610,678 ; US4,673,402 ; US4,834,735 ; US4,888,231 ; US5,137,537 ; US5,147,345 ; US5,342,338 ; US5,260,345 ; US5,387,207 ; US5,397,316 ; US5,625,222 .
  • Suitable materials and constructions for a suitable absorbent core are described in, but are not limited to, US2008/0,312,617A1 and US9,060,904 ; and US8,017,827 ; and US8,496,637 .
  • the adhesives of the present invention may be used within or near the core to immobilize the core, immobilize absorbent material, or to bond the core substrate to the absorbent polymer material, among other uses.
  • a particularly suitable outer cover 26a is available from Corovin GmbH, Peine, Germany as supplier code A18AH0, and a particularly suitable inner layer 26b is available from RKW Gronau GmbH, Gronau, Germany as supplier code PGBR4WPR. While a variety of backsheet configurations are contemplated herein, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention.
  • the diaper 20 may also include a fastening system 50.
  • the fastening system 50 When fastened, the fastening system 50 interconnects the front waist region 36 and the rear waist region 38 resulting in a waist circumference that may encircle the wearer during wear of the diaper 20.
  • the fastening system 50 may comprises a fastener such as tape tabs, hook and loop fastening components, interlocking fasteners such as tabs & slots, buckles, buttons, snaps, and/or hermaphroditic fastening components, although any other known fastening means are generally acceptable.
  • FIG. 1 depicts a fastening system 50 having an engaging member 52 and a receiving member 54.
  • the engaging member 52 is shown having an engaging surface 53 that may comprise hooks, loops, an adhesive, a cohesive, or other fastening member.
  • the receiving member 54 may have a surface that allows for engagement of the engaging member 52.
  • the receiving member 54 may comprise hooks, loops, an adhesive, a cohesive, or other fastening component that can receive the engaging member 52.
  • Suitable engaging member 52 and receiving member 54 combinations include but are not limited to hooks/loop, hooks/hooks, adhesive/polymeric film; cohesive/ cohesive, adhesive/adhesive; tab/slot; and button/button hole.
  • the diaper 20 may include barrier cuffs 60 and/or gasketing cuffs 70.
  • Gasketing cuffs 70 may also be referred to as outer leg cuffs, leg bands, side flaps, leg cuffs, or elastic cuffs.
  • Barrier cuffs 60 may also be referred to as second cuffs, inner leg cuffs or "stand-up" elasticized flaps.
  • the barrier cuff 60 may have a distal edge 61 and a proximal edge 63 that run substantially parallel to the longitudinal centerline 100.
  • the barrier cuff 60 may span the entire longitudinal length of the diaper 20.
  • the barrier cuff 60 may be formed by a flap 62 and an elastic member 64 (such as elastic strands).
  • the flap 62 may be a continuous extension of any of the existing materials or elements that form the diaper 20.
  • the barrier cuff 60 may be a discrete element.
  • the barrier cuff 60 comprising the flap 62 and the elastic member 64 may be formed then joined to the chassis 22 by a bond 65.
  • the flap 62 may comprise a variety of substrates such as plastic films and woven or nonwoven webs of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., polyester or polypropylene fibers), or a combination of natural and synthetic fibers.
  • the flap 62 may comprise a nonwoven web such as spunbond webs, meltblown webs, carded webs, and combinations thereof (e.g., spunbond-meltblown composites and variants). Laminates of the aforementioned substrates may also be used to form the flap 62.
  • a particularly suitable flap may comprise a nonwoven available from BBA Fiberweb, Brentwood, TN as supplier code 30926.
  • the elastic member 64 generally spans the longitudinal length of the barrier cuff 60. In other embodiments, the elastic member 64 may span at least the longitudinal length of the barrier cuff 60 within the crotch region 37. It is desirable that the elastic member 64 exhibits sufficient elasticity such that the proximal edge 63 of the barrier cuff 60 remains in contact with the wearer during normal wear, thereby enhancing the barrier properties of the barrier cuff 60.
  • the elastic member 64 may be connected to the flap 62 at opposing longitudinal ends. In certain embodiments, the flap 62 may be folded over onto itself so as to encircle the elastic member 64. A bond 67 may be used to secure the folded section of the flap 62.
  • the front and/or back ears 40, 42 may comprise a discrete element joined to the chassis 22 with the chassis 22 having a layer, element, or substrate that extends over the front and/or back ear 40, 42.
  • the front ears 40 and back ears 42 may be extensible, inextensible, elastic, or inelastic.
  • the front ears 40 and back ears 42 may be formed from nonwoven webs, woven webs, knitted fabrics, polymeric and elastomeric films, apertured films, sponges, foams, scrims, and combinations and laminates thereof.
  • the front ears 40 and back ears 42 may be formed of a nonwoven/elastomeric material laminate or a nonwoven/elastomeric material/nonwoven laminate.
  • the diaper 20 may be preformed by the manufacturer to create a pant.
  • a pant may be preformed by any suitable technique including, but not limited to, joining together portions of the article using refastenable and/or non-refastenable bonds (e.g., seam, weld, adhesive, cohesive bond, fastener, etc.).
  • the diaper 20 of FIG. 1 may be manufactured with the fastening system 50 engaged ( e.g. , the engaging member 52 is joined to the receiving member 54).
  • the diaper 20 of FIG. 1 may be manufactured with the front ears 40 joined to the back ears 42 by way of a bond such as an adhesive bond, a mechanical bond, or some other bonding technique known in the art.
  • Suitable pants are disclosed in U.S.
  • Nonwovens in the present invention may be such as those disclosed in US10,716,712 ; US8,388,594 ; US8,226,625 ; US8,231,595 and US8,226,626 .
  • an adhesive composition comprising at least 90 wt. %, alternatively at least 95 wt. %, alternatively at least 98 wt. %, and alternatively at least 99 wt. % of a copolymer.
  • the copolymer may be an amorphous copolymer having a crystalline content of less than 10 wt. %, alternatively less than 5 wt. %.
  • the copolymer comprises from about 30 wt. % to about 70 wt. % of propene monomer units, alternatively from about 35 wt. % to about 65 wt. %, alternatively from about 40 wt. % to about 60 wt. %, alternatively from about 40 wt. % to about 55 wt. %, alternatively from about 45 wt. % to about 55 wt. %, alternatively from about 44 wt. % to about 46 wt. %, and alternatively from about 48 wt. % to about 52 wt. %.
  • the percentage of propene monomer units may be determined by a suitable method, such as nuclear magnetic resonance or infrared spectroscopies, known to those of skill in the art.
  • the copolymer can comprise from about 30 wt. % to about 70 wt. % of 1-butene monomer units, , alternatively from about 35 wt. % to about 65 wt. %, alternatively from about 40 wt. % to about 60 wt. %, alternatively from about 45 wt. % to about 60 wt. %, alternatively from about 45 wt. % to about 55 wt. %, alternatively from about 50 wt. % to about 60 wt. %, alternatively from about 54 wt. % to about 56 wt. %, and alternatively from about 48 wt. % to about 52 wt. %.
  • the percentage of 1-butene monomer units may be determined by a suitable method, such as nuclear magnetic resonance or infrared spectroscopies, known to those of skill in the art.
  • the copolymer can be prepared by the methods described in US5,302,675 and US5,723,546 , which are both expressly incorporated herein.
  • the copolymer may be prepared using a single-site catalyst system, multiple single-site catalyst systems, or Ziegler Natta catalyst system.
  • Monomers used to prepare the copolymer can be obtained from one or more carbon-based sources, e.g., biomass from animal and/or vegetable fats.
  • the monomers can also be obtained from renewable feed stocks provided by, e.g., Neste's Rotterdam Refinery (Neste, Finland).
  • the copolymer can be selected from REXtac R copolymers 2815 and 2830. See, for example, Sustic, US5,723,546 , which is expressly incorporated by reference, for a description of additional exemplary copolymers.
  • the adhesive composition comprises less than 0.5 wt. %, and alternatively less than 0.1 wt. % of a tackifier.
  • exemplary tackifiers can include aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated poly-cyclopentadiene resins, poly-cyclopentadiene resins, gum rosins, gum rosin esters, wood rosins, wood rosin esters, tall oil rosins, tall oil rosin esters, poly-terpenes, aromatic modified poly-terpenes, terpene-phenolics, aromatic modified hydrogenated poly-cyclopentadiene resins, hydrogenated aliphatic resins, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, and hydrogenated rosin esters.
  • the adhesive composition is free of a heterophase copolymer.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a rheology and thermal stability suitable for use with conventional hot melt adhesive application equipment.
  • the copolymer, as well as adhesive compositions comprising the copolymer, having a desired viscosity at the application temperature can facilitate flow of the copolymer, as well as adhesive compositions comprising the copolymer, through a coating apparatus, e.g., a coating die or a spray nozzle.
  • Desirable viscosity values can be useful for ensuring that the copolymer, as well as adhesive compositions comprising the copolymer, is compatible with adhesive application methods and equipment.
  • a viscosity value that is too high may not be compatible with certain application methods and equipment, e.g., spraying methods and nozzles.
  • the adhesive compositions comprising the copolymer have an Enthalpy of Fusion at 1 °C/min cooling rate of less than 17 J/g, alternatively less than 16.5 J/g, alternatively less than 16 J/g, alternatively from about 6.5 J/g to 17 J/g, alternatively from about 7 J/g to about 16.5 J/g, alternatively from about 8 J/g to about 16 J/g, alternatively from about 8.7 J/g to about 15.8 J/g, and alternatively from about 10 J/g to about 16 J/g, as measured by the Enthalpy of Fusion Test Method described herein.
  • the adhesive compositions comprising the copolymer have a Tensile Strength at Yield of from about 0.5 MPa to about 1.5 MPa, alternatively from about 0.7 MPa to about 1.4 MPa, alternatively from about 0.8 MPa to about 1.35 MPa, alternatively from about 0.9MPa to about 1.3 MPa, and alternatively from about 0.95 MPa to about 1.25 MPa, as measured by the Tensile Strength Test Method described herein.
  • a Tensile Strength at Yield value that is too low may indicate that the copolymer, as well as adhesive compositions comprising the copolymer, is too week and will not provide sufficient tensile strength for a product during use.
  • a Tensile Strength at Yield value that is too high may indicate that the copolymer, as well as adhesive compositions comprising the copolymer, is too stiff and cannot sufficiently absorb the stresses applied to the copolymer, as well as adhesive compositions comprising the copolymer, during product use.
  • the adhesive compositions comprising the copolymer can exhibit surprisingly high values in the Static Peel Time Test Method described herein, as shown in Table 2 below.
  • the adhesive compositions comprising the copolymer have a Static Peel Time of at least 220 seconds, alternatively at least 230 seconds, alternatively from about 220 seconds to about 750 seconds, alternatively from about 225 seconds to about 600 seconds, alternatively from about 230 seconds to about 500 seconds, and alternatively from about 230 seconds to about 400 seconds, and alternatively from about 235 seconds to about 350 seconds, when performed using a 25-gram weight and a 40-mm wide test sample having a coat weight of about 2.2 gsm, as measured by the Static Peel Time Test Method described herein.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a Needle Penetration of from about 10 decimillimeters to about 35 decimillimeters, alternatively from about 15 decimillimeters to about 30 decimillimeters, and alternatively from about 17 decimillimeters to about 21 decimillimeters, as measured by the Needle Penetration Test Method described herein.
  • a Needle Penetration value that is too high may indicate that the copolymer, as well as adhesive compositions comprising the copolymer, is too soft and will not provide sufficient bond strength for a product, leading to a cohesive failure of the adhesive in the bond.
  • a Needle Penetration that is too low may indicate that the copolymer, as well as adhesive compositions comprising the copolymer, is too stiff and cannot sufficiently absorb the stresses applied to the copolymer, as well as adhesive compositions comprising the copolymer, during product use.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a density of from about 0.4 g/cm 3 to about 0.87 g/cm 3 , alternatively from about 0.5 g/cm 3 to about 0.85 g/cm 3 , alternatively from about 0.7 g/cm 3 to about 0.85 g/cm 3 , alternatively from about 0.75 g/cm 3 to about 0.85 g/cm 3 , and alternatively from about 0.8 g/cm 3 to about 0.85 g/cm 3 at 150 °C.
  • adhesive compositions without tackifiers generally have an about 10% lower density than tackifier containing adhesive compositions, as known in the art. This is because tackifiers have normally a density of about 1 g/cm 3 , which is a density higher than the density of the other adhesive ingredients.
  • the volume of an adhesive layer in a laminate and not the mass of the adhesive layer governs the bond strength of the laminate, which can e.g. be measured as "static peel.” Without wishing to be bound by theory, it is believed that this is due to structure mechanics laws which suggest a higher stress concentration occurring in thinner adhesive layers upon deformation. This makes thinner adhesive layers more prone to breaking upon exertion of a peeling or shearing force onto the laminate. In order to enable more robust bonds in a laminate, the adhesive layer is typically with a larger thickness.
  • an adhesive composition with lower density as described herein, the same quality of a bond can be achieved with a lower mass of adhesive.
  • a hygiene adhesive like e.g. material cost or transportation cost
  • an adhesive with lower density enables significant commercial advantages.
  • An adhesive composition with a lower storage modulus offers less resistance to these small strain deformations and is better able to divert the mechanical stress away from the interface into the bulk of the adhesive, or in other words towards the center of the adhesive layer.
  • plastic yielding can then occur, a mechanism which highly effectively absorbs the energy of the deformation and thereby prevents the breaking of the bond. This mechanism is also referred to as "energy dissipation”.
  • the mechanical energy is transformed into heat while the bond as a whole continues to stay intact.
  • Static Peel Time a laminate with an adhesive composition with a lower storage modulus can keep the weight for longer time before the bond fails and the weight falls down. So there is an upper limit for the storage modulus.
  • the adhesive composition offers too little elastic resistance to said deformations, the laminate will have an insufficient bond strength performance, e.g. a too low static peel time, as well.
  • the adhesive formulations described herein excel by ranges of the three material parameters which enable the desired mechanical performance of the laminate.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a Storage Modulus at 37 °C of from about 3 MPa to about 9.5 MPa, alternatively from about 4.5 MPa to about 9.5 MPa, alternatively from about 5 MPa to about 9.25 MPa, and alternatively from about 5.5 MPa to about 9.1 MPa, as measured by the Oscillatory Rheometry Test described herein.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a Yield Stress at 37 °C of from about 0.8 MPa to about 1.45 MPa, alternatively from about 0.9 MPa to about 1.4 MPa, alternatively from about 1 to about 1.4 MPa, as measured by the Yield Stress Test Method described herein.
  • the copolymer, as well as adhesive compositions comprising the copolymer can have a Toughness at 37 °C of from about 2 MJ/m 3 to about 8 MJ/m 3 , alternatively from about 2 MJ/m 3 to about 6 MJ/m 3 , alternatively from about 2 MJ/m 3 to about 5 MJ/m 3 , alternatively from about 2 MJ/m 3 to about 4 MJ/m 3 , and alternatively from about 2.4 MJ/m 3 to about 4 MJ/m 3 , as measured by the Toughness Test Method described herein.
  • the adhesive composition described herein can comprise less than 10 wt. %, alternatively less than 5 wt. %, alternatively less than 3 wt. %, alternatively less than 2 wt. %, alternatively less than 1 wt. %, alternatively less than 0.5 wt. %, alternatively less than 0.3 wt. %, alternatively less than 0.2 wt. %, alternatively less than 0.1 wt. %, and alternatively less than 0.05 wt. % of one or more optional ingredients.
  • the adhesive composition can optionally include a plasticizer or plasticizing oil or extender oil that may reduce the viscosity or improve tack properties in the adhesive composition.
  • plasticizers include olefin oligomers, low molecular weight polyolefins such as liquid polybutenes, low molecular weight non-aromatic polymers (e.g. REGALREZ 101 from Eastman Chemical Company), phthalates, mineral oils such as naphthenic, paraffinic, or hydrogenated (white) oils (e.g. Kaydol oil or ParaLux oils (Chevron U.S.A. Inc.)), vegetable and animal oils and their derivatives, petroleum derived oils, and combinations thereof.
  • plasticizers include olefin oligomers, low molecular weight polyolefins such as liquid polybutenes, low molecular weight non-aromatic polymers (e.g. REGALREZ 101 from Eastman Chemical Company), phthalates, mineral oils such as naphthenic, paraffinic
  • the plasticizers can include polypropylene, polybutene, hydrogenated polyisoprene, hydrogenated polybutadiene, polypiperylene, copolymers of piperylene and isoprene, as described in U.S. Patent 8,865,824 ,
  • the adhesive composition can optionally include an antioxidant or a stabilizer. Any antioxidant known to a person of ordinary skill in the art may be used in the adhesion composition.
  • Non-limiting examples of suitable antioxidants include amine-based antioxidants such as alkyl diphenyl amines, phenyl-naphthylamine, alkyl or aralkyl substituted phenyl-naphthylamine, alkylated p-phenylene diamines, tetramethyl-diaminodiphenylamine and the like; and hindered phenol compounds such as 2,6-di-t-butyl-4-methylphenol; 1,3,5-trimethyl-2,4,6-tris(3',5'-di-t-butyl-4'-hydroxybenzyl)benzene; tetra kis [(methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane (e.g., IRGANOX TM 1010, from Ciba Geigy, New York); octadecyl-3,5-di-t-butyl-4-
  • the amount of the antioxidant in the composition can be less than 1 wt. %, alternatively from about 0.05 wt. % to about 0.75 wt. %, and alternatively from about 0.1 wt. % to about 0.5 wt. % of the total weight of the adhesive composition.
  • the adhesive composition can optionally include a UV stabilizer that may prevent or reduce the degradation of the composition by radiation.
  • a UV stabilizer known to a person of ordinary skill in the art may be used in the adhesion composition.
  • suitable UV stabilizers include benzophenones, benzotriazoles, aryl esters, oxanilides, acrylic esters, formamidine carbon black, hindered amines, nickel quenchers, hindered amines, phenolic antioxidants, metallic salts, zinc compounds, and combinations thereof.
  • the amount of the UV stabilizer in the adhesive composition can be less than 1 wt. %, alternatively from about 0.05 wt. % to about 0.75 wt. %, and alternatively from about 0.1 wt. % to about 0.5 wt. % of the total weight of the adhesive composition.
  • the adhesive composition can optionally include a brightener, colorant, and/or pigment. Any colorant or pigment known to a person of ordinary skill in the art may be used in the adhesive composition.
  • suitable brighteners, colorants, and/or pigments include fluorescent materials and pigments such as triazine-stilbene, coumarin, imidazole, diazole, titanium dioxide and carbon black, phthalocyanine pigments, and other organic pigments such as IRGAZINB, CROMOPHTALB, MONASTRALB, CINQUASIAB, IRGALITEB, ORASOLB, all of which are available from Ciba Specialty Chemicals, Tarrytown, N.Y.
  • the adhesive composition can optionally include a fragrance such as a perfume or other odorant.
  • a fragrance such as a perfume or other odorant.
  • Such fragrances may be retained by a liner or contained in release agents such as microcapsules that may, for example, release fragrance upon removal of a release liner from or compression on the adhesive composition.
  • the adhesive composition can optionally include a filler.
  • a filler Any filler known to a person of ordinary skill in the art may be used in the adhesive composition.
  • suitable fillers include sand, talc, dolomite, calcium carbonate, clay, silica, mica, wollastonite, feldspar, aluminum silicate, alumina, hydrated alumina, glass bead, glass microsphere, ceramic microsphere, thermoplastic microsphere, barite, wood flour, and combinations thereof.
  • the amount of the filler in the adhesive composition can be less than 60 wt. %, alternatively from about 1 wt. % to about 50 wt. %, and alternatively from about 5 wt. % to about 40 wt. % of the total weight of the adhesive composition.
  • the adhesive compositions described herein have industrial applications in sanitary disposable consumer articles, for example, diapers, feminine care pads, and napkins.
  • Articles can include items having any two or more substrates adhesively bonded by a hot melt adhesive composition, such as disposable articles such as diapers or feminine napkins.
  • the substrates can include thermoplastics, thermoset polymers, polyesters, polyethylene terephthalate, polyamides, nylons, polypropylene, and combinations, blends, or layered composites thereof.
  • the substrates can include, in some applications, coatings of wax, acrylate polymers, or other materials, colorants, preservatives, stabilizers, processing lubricants, and combinations thereof.
  • the substrates can include solid, nonporous or breathable films.
  • the substrates can include nonwoven fabrics and films (e.g., polyethylene films), in some applications.
  • the adhesive compositions can be used as a construction adhesive in assembly of commonly available consumer disposal articles. Such articles include infant diapers, adult diapers, bed pads, sanitary products, and other absorbent articles. Combining at least a polymer film with other films and fibrous materials typically makes these articles. Fibrous materials can include fabrics such as woven or nonwoven fabrics, fibers in the form of fiber vats, fiber collections, fiber balls, etc.
  • Such absorbent articles typically include an absorbent held within the article.
  • the absorbent is usually covered using a nonwoven inner liner.
  • Such liners include a highly permeable material such as a spun bonded nonwoven structure that passes fluids or moisture from the interior of the article into the absorbent layer.
  • the absorbent layer or structure formed within the absorbent article typically includes a fiber mass pad or cellulosic or wood pulp for the purpose of absorbing liquid or fluid materials released into the absorbent article.
  • the fiber or fluff can include a cellulosic fiber, a synthetic fiber or mixtures thereof such as blends of wood fiber, cellulosic fiber, polyethylene fiber, polypropene fiber or other fiber materials often including a super absorbent material.
  • Super or highly absorbent materials are used to increase the absorptive capacity of the absorbent article.
  • Such materials are organic materials including modified natural gums and resins but often include synthetic polymer materials such as hydrogels.
  • Nonwoven fabric layers used in such disposal articles typically are generally planar structures including a bonded assembly of natural or synthetic fiber.
  • nonwoven materials are often made using a variety of techniques, including spun bonding, melt bonding, etc. Such nonwoven materials are often manufactured by randomly placing fibers or rovings in a random pattern and are then thermally bonded using inherent bonding characteristics of the fibers or by bonding the fibers using resin materials applied to the fibers.
  • Various polymers can be used to make nonwoven materials including poly olefins, polyesters, ethylene vinyl acetate polymers, ethylene acrylic acid polymers and others.
  • the exterior of the article often includes a polymer film that is liquid impervious.
  • exterior polymer films can be further modified using additional exterior layers to obtain a more cloth like or nonwoven character to the exterior polymer film.
  • the exterior film typically includes a single layer of a polymer film but can be a multi-layer film structure.
  • Typical polymer sheet materials include high tensile strength polymers including polyesters, poly olefins or other thermoplastic sheet materials that can be formed into film layers.
  • the polyolefin or polyester polymer materials are often formed into sheets and are treated to improve strength, flexibility and puncture resistance. Techniques including biaxial orientation, heat treatment or surface treatment can improve the film characteristics of the polymer films.
  • Such polymer films often have a thickness that ranges from about 0.5 mils (e.g., one thousandth of an inch) to about 1.5 mils.
  • the Oscillatory Rheometry Test Method is used to measure the Storage Modulus and the Loss Factor of a hot melt adhesive composition.
  • a controlled-stress rotational rheometer (such as Discovery HR-3, TA Instruments, New Castle, DE, USA, or equivalent) capable of sample temperature control (using a Peltier cooler and resistance heater combination) with a precision equal to or exceeding 0.5 °C over at least the range of -10 °C to 150 °C.
  • the rheometer is operated in a parallel plate configuration with 20-mm stainless steel parallel-plate tooling.
  • a parallel plate gap of 1000 ⁇ m is initially used in the method.
  • the gap is set to 1000 ⁇ m, and a mapping of actual plate gap (as measured using a suitable standard test fluid) a function of temperature over the range -10 °C to 150 °C is performed. This mapping is then used throughout the determination of the Storage Modulus Parameter and the Loss Factor Parameter.
  • the rheometer is heated to 150 °C, hot melt adhesive composition is introduced in the rheometer, the gap is set to 1050 ⁇ m, excess protruding sample is trimmed, and the gap is then set to 1000 ⁇ m.
  • the axial force control of the rheometer is set to be maintained within ⁇ 0.1 N of force, and the thermal expansion/contraction of the sample itself is compensated in order to avoid overfilling or underfilling of the gap in addition to the abovementioned compensation of the tooling.
  • the rheometer is then allowed to cool to 130 °C, at which point the measurement commences with temperature ramped from 130 °C to -10 °C at a constant rate of cooling of 2 °C/min.
  • the applied strain amplitude is 0.1%, and the frequency of oscillation is 1 Hz (that is, one cycle per second). The resulting oscillatory stress is recorded.
  • the sample temperature is set to 23 °C (temperature is ramped to this setpoint at a rate of 10 °C/min), and the sample is allowed to rest for 4.0 hours at 23 °C.
  • the temperature is set to -10 °C (temperature is ramped to this setpoint at a rate of 10 °C/min), the sample is equilibrated for 300 seconds at -10 °C, and a second oscillatory rheology measurement is conducted (0.1% strain, frequency of oscillation of 1 Hz) while temperature is ramped upward to 130 °C at a constant rate of increase of 2 °C/min.
  • the storage modulus G' is calculated and recorded at 23 °C and 37 °C, and these values are reported in megapascals (MPa) to the nearest 0.01 MPa as the "Storage Modulus at 23 °C” and the “Storage Modulus at 37 °C,” respectively.
  • the loss factor also known as tan delta
  • these dimensionless values are reported to the nearest hundredth as the "Loss Factor at 23 °C” and the "Loss Factor at 37 °C,” respectively.
  • the Extensional Test Method is used to determine the Yield Stress and the Toughness for a specimen of an adhesive composition.
  • a thin film specimen formed of adhesive composition is analyzed with a rotational rheometer fitted with a specialized fixture with counter rotating rollers, and the stress associated with extensional strain imparted is measured and recorded.
  • a rotational rheometer (ARES G2, TA Instruments, New Castle, DE, USA, or equivalent) is fitted with a fixture that has counter rotating cylindrical rollers specifically designed for the interrogation of extension deformation of films.
  • An example of a suitable fixture is the Extensional Viscosity Fixture, or EVF (EVF, TA Instruments, or equivalent).
  • the rheometer is further fitted with a forced-convection oven FCO (FCO, TA Instruments, or equivalent) and cooling system (ACS 2, TA Instruments, or equivalent) capable of controlling temperate from at least -50 to 250 °C to a within a tolerance of 0.5 °C.
  • FCO forced-convection oven
  • ACS 2 TA Instruments, or equivalent
  • Approximately 10 g of the adhesive composition is placed in a polytetrafluoroethane (PTFE) bowl and introduced into a vacuum oven. After 15 minutes at 170 °C at ambient pressure, the pressure is lowered to 10 mbar, and the adhesive composition is subsequently held at 170 °C and at 10 mbar for 45 minutes to remove air bubbles from the adhesive composition. The adhesive composition is removed from the vacuum oven and allowed to cool to ambient lab conditions (23 ⁇ 2 °C) for 90 ⁇ 30 minutes, at which point the adhesive composition is removed from the PTFE bowl and placed between 2 sheets of siliconised paper.
  • PTFE polytetrafluoroethane
  • a metal shim 0.50 mm in thickness is used in the heated press as a spacer to obtain a film thickness of 0.50 mm when pressed with a heated press at 90 °C for 60 seconds at a pressure sufficient to form a polymeric film. If 90 °C is insufficient to melt the adhesive composition, a higher temperature (but the lowest temperature sufficient to melt the composition) is used.
  • the film is stored at least 120 hours in the laboratory at 23 ⁇ 2 °C prior to testing. From the film individual specimens for measurement are punched with a sample cutter to the final specimen dimensions of 20.0 mm by 10.0 mm by 0.50 mm.
  • Table 2 shows exemplary and comparative adhesive compositions. Table 2 Viscosity @ 150 °C (mPa ⁇ s) Enthalpy of Fusion (J/g) Static Peel Time (seconds) Tensile Strength at Yield (MPa) Adhesive Composition A 6300 15.8 325 1.10 Adhesive Composition B 5600 10.1 323 0.96 Adhesive Composition C 5700 10.1 292 0.99 Adhesive Composition D 5600 12.9 249 1.25 Adhesive Composition E 5700 13.5 235 1.00 Adhesive Composition F 8200 6.0 214 0.31 Adhesive Composition G 4900 17.6 192 1.35 Adhesive Composition H 5500 17.3 190 1.50 Adhesive Composition I 5700 17.2 169 2.03 Adhesive Composition J 5500 18.7 168 1.99 Adhesive Composition K 4900 18.1 167 1.20 Adhesive Composition L 3900 5.2 135 0.28 Adhesive Composition M 5800 20.1 112 1
  • Adhesive Compositions A-Q include exemplary and comparative Adhesive Compositions.
  • Each Adhesive Composition A-Q includes at least 99% of one copolymer, wherein the copolymers vary and each copolymer comprises from about 50% to about 60% of 1-butene monomer units and from about 40% to about 50% propene monomer units.
  • the copolymers vary and each copolymer comprises from about 50% to about 60% of 1-butene monomer units and from about 40% to about 50% propene monomer units.
  • During some testing less than 1% of antioxidants and other minor ingredients were added for preservation and packaging purposes, but it is believed that the 1% of antioxidants and the other minor ingredients had no effect on the provided data in Tables 2 and 3.
  • Table 3 shows additional parameters associated with a select group of the exemplary and comparative adhesive compositions in Table 2.
  • Table 3 Static Peel Time (seconds) Yield Stress at 37 °C (MPa) Storage Modulus at 37 °C / 1 Hz (MPa) Toughness at 37 °C / 1 Hz (Mj/m 3 )
  • Adhesive Composition I 169 1.59 9.76 1.19 Adhesive Composition K 167 1.53 13.50 1.31

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dermatology (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (7)

  1. Article absorbant ayant une ligne médiane longitudinale et une ligne médiane latérale, une région de taille avant avec un bord de taille avant, une région de taille arrière avec un bord de taille arrière, une région d'entrejambe disposée entre la région de taille avant et la région de taille arrière, et deux bords latéraux longitudinaux espacés reliant le bord de taille avant au bord de taille arrière, dans lequel l'article absorbant comprend un ensemble de composants, et dans lequel l'ensemble de composants comprend :
    a) une feuille supérieure ;
    b) une feuille inférieure se trouvant sous la feuille supérieure ;
    c) une âme absorbante disposée entre la feuille supérieure et la feuille inférieure, dans lequel l'âme absorbante comprend au moins l'un parmi un revêtement d'âme, une couche de poudrage, une couche de recueil, une couche de répartition et un élément de stockage ;
    d) au moins un composant supplémentaire choisi dans le groupe constitué :
    i) d'un système de fixation permettant de relier la région de taille avant à la région de taille arrière lorsque l'article absorbant est porté ;
    ii) de revers formant barrières se trouvant adjacents aux deux bords latéraux longitudinaux espacés et à l'intérieur de ceux-ci ;
    iii) de revers d'étanchéité se trouvant entre chacun parmi les deux bords latéraux longitudinaux espacés et les revers formant barrière ;
    iv) des pattes avant disposées dans la région de taille avant ;
    v) des pattes arrière disposées dans la région de taille arrière ; et
    vi) un élément de réception ; et
    e) une composition adhésive reliant au moins deux composants parmi l'ensemble de composants ensemble, dans lequel la composition adhésive comprend au moins 90 % en poids d'un copolymère, dans lequel le copolymère comprend environ 30 % en poids à environ 70 % en poids de motifs monomères propène et environ 30 % en poids à environ 70 % en poids de motifs monomères 1-butène ;
    dans lequel la composition adhésive a une viscosité allant d'environ 2000 mPa·s à environ 11 500 mPa·s à 150 °C, telle que mesurée par le procédé de test de viscosité ;
    dans lequel la composition adhésive a une enthalpie de fusion inférieure à 17 J/g, telle que mesurée par le procédé de test d'enthalpie de fusion ;
    dans lequel la composition adhésive a une résistance à la traction à la limite d'élasticité allant d'environ 0,5 MPa à environ 1,5 MPa, telle que mesurée par le procédé de test de résistance à la traction ;
    dans lequel la composition adhésive a un temps de décollement statique d'au moins 220 secondes, tel que mesuré par le procédé de test de temps de décollement statique ; et
    dans lequel la composition adhésive est exempte de copolymère hétérophasique ; et
    dans lequel la composition adhésive comprend moins de 0,5 % en poids d'un agent poisseux.
  2. Article absorbant selon la revendication 1, dans lequel la composition adhésive relie la feuille supérieure à une couche de non-tissé sous-jacente.
  3. Article absorbant selon l'une quelconque des revendications précédentes, dans lequel la composition adhésive relie la feuille supérieure à la feuille inférieure à côté de l'un des deux bords latéraux longitudinaux espacés.
  4. Article absorbant selon la revendication 1, dans lequel la composition adhésive relie la couverture d'âme à la couche de poudrage.
  5. Article absorbant selon la revendication 1, dans lequel la composition adhésive relie la couche de poudrage à la feuille inférieure.
  6. Article absorbant selon l'une quelconque des revendications précédentes, dans lequel la composition adhésive comprend au moins 95 % en poids du copolymère.
  7. Article absorbant selon l'une quelconque des revendications précédentes, dans lequel le copolymère comprend environ 45 % en poids à environ 55 % en poids de motifs monomères 1-butène.
EP19724298.5A 2018-04-20 2019-04-18 Article absorbant comprenant une composition adhésive Active EP3781105B1 (fr)

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US201862660357P 2018-04-20 2018-04-20
PCT/US2019/028020 WO2019204544A1 (fr) 2018-04-20 2019-04-18 Article absorbant comprenant une composition adhésive

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EP (1) EP3781105B1 (fr)
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CN111971007A (zh) 2020-11-20
CN111971007B (zh) 2022-06-24
EP3781105A1 (fr) 2021-02-24
US20190321241A1 (en) 2019-10-24
WO2019204544A1 (fr) 2019-10-24

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